Wireless communication system

ABSTRACT

A wireless communication system includes: a filter; and a semiconductor chip including a signal processing integrated circuit having an amplifier, wherein a main surface of the semiconductor chip is provided with a plurality of electrode terminals along an edge portion thereof; wherein the amplifier has a transistor including a control electrode, a first electrode through which a signal is outputted, and a second electrode to which a voltage is applied; wherein the control electrode, the first electrode and the second electrode of the transistor are connected to the electrode terminals, respectively; and wherein none of wirings are arranged between the electrode terminals and placements of the control electrode, the first electrode and the second electrode, making space between the electrodes and the electrode terminals narrow.

This is a continuation application of U.S. application Ser. No.11/325,528, filed Jan. 5, 2006 now U.S. Pat. No. 7,274,923, which is acontinuation application of U.S. application Ser. No. 09/785,500, filedFeb. 20, 2001, now U.S. Pat. No. 7,013,123.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates, in general, to a wireless communicationsystem. More particularly, the invention relates to the technology whichis effectively employed to the layout technique of internal circuits ofa reception integrated circuit for the wireless communication in whichthe high frequency characteristics become excellent.

2. Description of the Related Art

In a signal processing integrated circuit (IC) in a wirelesscommunication system (an terminal apparatus of a wireless communicationmobile body; it will hereinafter also be. referred to as “a terminalapparatus” for short, when applicable) such as a digital cellularsystem, a large number of internal circuits are incorporated in a singlesemiconductor chip.

The signal processing IC for example, is described in an article of“DIGEST OF TECHNICAL PAPERS”, ISSC98/Feb. 5, 1998, pp. 48 to 49, pp. 441“A SINGLE-CHIP CMOS TRANSCEIVER FOR DCS1800 WIRELESS COMMUNICATIONS”. Inthis article, there is disclosed an IC in which a DCS (Digital CellularSystem) 1800 oriented transmitting and receiving circuit is formed inone chip. In accordance with the layout photograph, a power source lineor a ground line is present in the inside of the line of electrodeterminals (pads), and LNA (Low-Noise Amplifier) circuits are arranged inthe inside of the power source line or the ground line, and a powersource line or a ground line is arranged in the inside of the LNAcircuits.

In addition, the similar technique is described in an article of “DIGESTOF TECHNICAL PAPER”, ISSC99/Feb. 16, 1999, pp. 224 to 225, pp. 463“DUAL-BAND HIGH-LINEARITY VARIABLE-GAIN LOW-NOISE AMPLIFIERS FORWIRELESS APPLICATIONS”. In this article, there is disclosed an ICwherein two low-noise amplifiers, which are oriented to a 0.9, 2.0 GHzoriented dual band wireless communication transmitting/receiving IC, areformed in. the one chip, and electrostatic discharge protection circuitsare additionally provided therein, and also these constituent elementsare all encapsulated in a TSSOP (Thin Small Outline Package) 20pins-package. In accordance with the layout photograph, there exists apower source line and a ground line at the periphery of the circuitry,pads arranged at the inside of the periphery, the power source line andthe ground line layed out inside the pads and the LNA circuit arrangedinside the power source and the ground lines.

Further, as for other related application, there is a U.S. patentapplication Ser. No. 09/547,915 filed on Apr. 11, 2000 entitled“SEMICONDUCTOR INTEGRATED CIRCUIT” by Takikawa et al., the disclosure ofwhich is incorporated herein by reference.

In addition, in an article of “HITACHI REVIEW”, Vol 81, No. 10 (October,1999), pp. 17 to 20, there is described a signal processing IC in whichthe transmitting and receiving units including an LNA and a dualsynthesizer are formed in one chip. In this article, there is describedan IC for a dual band mobile telephone capable of carrying out a GSM(Global System for Mobile Communications) and the signal processing fora DCS 1800. In the GSM, the signal received through an antenna isfiltered by a band-pass filter which eliminates the unnecessary signalcomponents to extract a signal of 925 to 960 MHz. Then, the signal isamplified by the dedicated LNA circuit. Also, in the DCS 1800, thesignal received through an antenna is filtered by a band-pass filterwhich eliminates the unnecessary signal components to extract a signalof 1805 to 1880 MHz. Thereafter, the signal is amplified by thededicated LNA circuit.

In the wireless communication system, since the low-noise amplifier(hereinafter, referred to as “the LNA” for short, when applicable)amplifies a received signal having a very small amplitude by a circuitin a first stage of the receiving system to send the amplified signal toa mixer as a next stage, the LNA controls greatly the wholecharacteristics of the receiving system. Therefore, the high frequencycharacteristics such as the high gain and the low noise are required forthe LNA. As to the factors of degrading these characteristics, thefollowing two points are considered.

-   (1) The negative feedback amount is increased and the gain is    reduced due to the parasitic inductance of the wire connected to the    emitter pad of a transistor constituting the LNA, and the leads    extending over the inside and the outside of the package.-   (2) If the wiring distance from the above-mentioned pad up to a base    of the transistor constituting the LNA circuit is long, then the    wiring capacitance is increased, the gain is reduced, and also the    noise characteristic is degraded due to the increase of the wiring    resistance.

On the other hand, in the conventional signal processing IC, there arethe following problems.

-   (a) In the case of the conventional signal processing IC having a    power source line and a ground line arranged between the edge    portion of the semiconductor chip and pads to be connected with    wirings, the wirings for connecting the pads and the inner ends of    leads become longer by the length over the power source and ground    lines, so that the gain is reduced and the noise characteristic is    degraded.-   (b) In also the case of the conventional signal processing IC in    which the power source line or the ground line is arranged between    the LNA circuit and the pads, similarly to the foregoing, the length    of the wiring is increased more, the gain is reduced and the noise    characteristic is degraded with the power source line and the ground    line arranged.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide a wirelesscommunication system capable of enhancing the gain and noisecharacteristic at the high frequency band.

Simply describing the outline of typical aspects of the presentinvention disclosed in the present specification, the configurationthereof is as follows.

-   (1) A dual band wireless communication system having: a filter    connected to an antenna; and a signal processing IC chip in which a    transmitting and receiving circuit including an amplifier (a    low-noise amplifier) connected to the filter is incorporated, and    also having that; a plurality of electrode terminals are provided in    a main surface of the IC chip along an edge of the main surface; the    amplifier has a transistor constituted by a control electrode to    which an output signal from the filter is supplied, a first    electrode through which a signal is outputted in accordance with the    signal supplied to the control electrode, and a second electrode to    which a voltage (a ground voltage) is applied; and the control    electrode, the first and second electrodes are connected to the    electrode terminals through the wirings, respectively wherein none    of wirings are arranged between the electrode terminals and    placements of the control electrode, the first electrode and the    second electrode.

In addition, no wiring is arranged between the electrode terminals andthe side of mounting the semiconductor chip.

Also, the amplifier is present on one edge portion of the semiconductorchip and is arranged in the vicinity of the center thereof.

The wirings extended from the electrode terminals are connected to thecontrol electrode of the transistor and one electrodes of electrostaticdischarge protecting diodes which are provided for the transistor. Thisis also applicable to the first electrode and the second electrode.

In accordance with the above-mentioned measure (1), (a) since any of thewirings other than those of the transistor is not arranged between theelectrode terminals and the electrodes (the control electrode, and thefirst and second electrodes) of the transistor, the distances betweenthe electrodes and the electrode terminals are each shortened, thewiring capacitance becomes small, the gain is increased and the wiringresistance is reduced, which results in the excellent noisecharacteristic.

-   (b) Since no wiring is arranged between the side of the    semiconductor chip and the electrode terminals, each of the lengths    of the wires through which the electrode terminals and the inner    ends of the leads are connected to one another is shortened, and the    parasitic inductance due to the distribution of the wires is    reduced, which results in the noise characteristics being excellent    and enhancement of the gain.-   (c) The amplifier is present on the edge portion of the    semiconductor chip and is arranged in the vicinity of the center of    the one edge portion. In the package structure employing the leads,    each of the lengths of the leads arranged in the vicinity of the    center of the above-mentioned one edge portion is also short. As a    result, the distances from the electrodes to the outer ends of the    leads projecting to the outside of the package become short, hence,    it is possible to realize the enhancement of the gain and the noise    characteristic.-   (d) Since the wirings extending from the electrode terminals are    connected to the control electrode and one electrodes of the    protection diodes provided for the above-mentioned transistor, such    configuration makes the design layout of the respective parts of the    circuit to be readily carried out.-   (e) In the wireless communication system, since the low-noise    amplifier amplifies the received signal having a very small    magnitude by the circuit in the first stage of the receiving system    to send the amplified signal to the mixer in the next stage, the    low-noise amplifier controls greatly the characteristic of the whole    receiving system. Therefore, as described above, the low-noise    amplifier becomes high gain and low noise, so, it is possible to    enhance the characteristic of the whole receiving system of the    wireless communication system.-   (f) Since from the item (e), the gain and the noise characteristic    of the low-noise amplifier are both excellent, the specification of    the circuit in the stages after the mixer can be made less severe,    and hence the circuit design can be readily carried out.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects as well as advantages of the presentinvention will become clear by the following description of thepreferred embodiments of the present invention with reference to theaccompanying drawings, wherein:

FIG. 1 is a schematic layout diagram showing a layout of low-noiseamplifiers incorporated in a semiconductor integrated circuit device foruse in a dual band wireless communication system in accordance with afirst embodiment of the present invention;

FIG. 2 is a block diagram, partly in circuit diagram, showing afunctional configuration of the wireless communication system of thefirst embodiment of the present invention;

FIG. 3 is a schematic plan view showing the layout within a package ofthe integrated circuit incorporating the semiconductor integratedcircuit of the first embodiment;

FIG. 4 is a schematic cross sectional view showing the construction ofthe semiconductor device shown in FIG. 3;

FIG. 5 is a schematic view of the layout showing the arrangement ofcircuits in an IC chip which incorporates the semiconductor integratedcircuit device shown in FIG. 3;

FIG. 6 is a schematic view showing the wiring pattern of a bipolartransistor constituting a low-noise amplifier in the IC chip shown inFIG. 5;

FIG. 7 is a schematic cross sectional view showing the wiring of thebipolar transistor shown in FIG. 6;

FIG. 8 is a schematic layout diagram, partly in circuit diagram, showingschematically a configuration of a part of a semiconductor integratedcircuit device and the like, in which low-noise amplifiers areincorporated, in a wireless communication system of a dual bandaccording to a second embodiment of the present invention;

FIG. 9 is a schematic plan view showing the wiring pattern of a bipolartransistor constituting a low-noise amplifier in an IC chip which isincorporated in a wireless communication system according to the secondembodiment of the present invention;

FIG. 10 is a schematic cross sectional view showing the construction ofa CSP type semiconductor integrated circuit device which is incorporatedin a wireless communication system according to a third embodiment ofthe present invention; and

FIG. 11 is a block diagram, partly in circuit diagram, showing thelayout of a multilayer ceramic substrate and the like which incorporatesthe semiconductor integrated circuit device using CSP shown in FIG. 10.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The embodiments of the present invention will hereinafter be describedin detail with reference to the accompanying drawings. In thisconnection, in all of the drawings for use in the description of theembodiments of the present invention, the constituent elements havingthe same function are designated with the same reference numerals, andthe repeated description thereof is omitted here for the sake ofsimplicity.

First Embodiment

FIGS. 1 to 7 are figures each of which relates to a wirelesscommunication system according to a first embodiment of the presentinvention. In the first embodiment, an example in which the presentinvention is applied to a wireless communication system of a TDMA (TimeDivision Multiple Access) system, e.g., a terminal apparatus of awireless communication mobile body will hereinbelow be described indetail.

Now, a configuration of a TDMA dual band wireless communication terminalapparatus will hereinbelow be described with reference to FIG. 2. Thisterminal apparatus can execute the signal processing for a GSM system ofa 900 MHz band and a DCS 1800 system of a 1800 MHz band.

In a block diagram shown in FIG. 2, a transmitting and receiving circuitelectrically connected to an antenna 330 through a transmitting andreceiving switching unit 331 are both shown and each of them isconnected to a base band signal processing circuit (not shown).

The receiving circuit includes: the antenna 330; the transmitting andreceiving switching unit 331; two band-pass filters 311 connected inparallel with the transmitting and receiving switching unit 331; a LNA(low-noise amplifier) 302 a for the high frequency band and a LNA 302 bfor the low-frequency band both connected to the band-pass filters 311,respectively; two band-pass filter 311 connected to the LNA 302 a forthe high frequency band and the LNA 302 b for the low frequency band,respectively; a high frequency band receiving mixer 303 a and a lowfrequency band receiving mixer 303 b connected to the two band-passfilters 311, respectively; a band-pass filter 311 connected to the highfrequency band receiving mixer 303 a and the low frequency bandreceiving mixer 303 b, respectively; a mixer 304 in the next stageconnected to the band-pass filter 311; a variable gain amplifier 305connected to the mixer 304 in the next stage; and a demodulator 306connected to the variable gain amplifier 305. Then, the receivingcircuit inputs I and Q signals outputted from the demodulator 306 to thebase band signal processing circuit. Each of the above-mentionedband-pass filters 311 eliminates the out-of-band spurious.

The transmitting circuit includes: a modulator 308 for receiving, as aninput signal thereof, the I and Q signals which are outputted from thebase band signal processing circuit; an offset PLL (Phase-Locked Loop)309; two VCOs (Voltage-Controlled Oscillator) 320 a and 320 b connectedin parallel with the offset PLL 309; high frequency power amplificationmodules 321 a and 321 b connected to the VCOs 320 a and 320 b,respectively; two LPFs (Low-Pass Filter) 322 connected to the highfrequency power amplifier modules 321 a and 321 b, respectively; thetransmitting and receiving switching unit 331 to which the two LPFs 322are connected; and the antenna 330.

The signal processing IC is provided with a synthesizer 310. Thissynthesizer 310 is connected to an IF (Intermediate) VCO 325 and carriesout the control in such a way that the IFVCO 325 outputs an IF localsignal. A divider 307 is connected to the VCO 325 to supply the localsignal of the lower frequency to each of the mixer 304 in the nextstage, the demodulator 306 and the modulator 308.

In addition, the synthesizer 310 is connected to the high frequency bandreceiving mixer 303 a, the low frequency band receiving mixer 303 a andthe offset PLL 309 through the two RFVCOs 326 a and 326 b which areconnected in parallel with each other to supply a local signal to eachof the high frequency band receiving mixer 303 a, the low frequency bandreception mixer 303 b and the offset PLL 309.

The transmitting and receiving IC 213 is constructed in such a way thatthe high frequency circuit of the dual band and the circuit of theintermediate frequency band are combined with each other to beself-contained in the form of one chip. The transmitting and receivingIC 213 is constituted by the circuits which are surrounded by a heavyline in FIG. 2. That is, the LNA 302 a for the high frequency band; theLNA 302 b for the low frequency band; the high frequency band receivingmixer 303 a; the low frequency band receiving mixer 303 b; the mixer 304in the next stage; the variable gain amplifier 305; the demodulator 306;the divider 307; the modulator 308; the offset PLL 309; the synthesizer310; and the IFVCO 325 are monolithically incorporated in the IC chip231.

The signal (the electric wave) received through the antenna 330 issuccessively processed in the constituent elements of the receivingcircuit to be sent to the base band signal processing circuit. Inaddition, the signal sent from the base band signal processing circuitis successively processed in the constituent elements of thetransmitting circuit to be radiated in the form of the electric wavethrough the antenna 330.

FIG. 5 is a schematic view of the layout corresponding to the circuitdiagram shown in FIG. 2 and showing the arrangement of the circuitsprovided in the IC chip 213. A plurality of electrode terminals (pads)212 are arranged along the edge portion on the main surface of the ICchip 213. In this connection, the pads 212 are the generic term of thepads 101 to 109 and 126 to 128 shown in FIG. 1. Then, the circuits arearranged in the respective areas defined on the main surface of the ICchip 213 in the inside of the arrangement of the pads 212. As shown inFIG. 5, a PGA (Programmable Gain Amplifier) 305 is arranged at thecenter of the IC chip (the semiconductor chip) 213, a MIX 304 isarranged in the upper part of the figure, and a DIV 307, a QMOD 308, anda DEMOD 306 are all arranged in the lower part of the figure. Inaddition, 1st MIXs 303 a and 303 b, LANs 302 a and 302 b, and an OPLL309 are arranged from the upper part to the lower part of the figure onthe left side of those constituent elements, while a Dual Synth 310 anda VCO 325 are arranged from the upper part to the lower part of thefigure on the right side thereof. In this connection, those circuitelements correspond to the circuits shown in FIG. 2 and the descriptionthereof will hereinbelow be given in detail.

The high frequency band receiving mixer 303 a and the low frequency bandreceiving mixer 303 b are both provided in the 1st MIX part, and themixer 304 in the next stage is provided in the 2nd MIX part.

The LNA 302 a for the high frequency band and the LNA 302 b for the lowfrequency band are both provided in the LNA part. The LNA 302 a for thehigh frequency band and the LNA 302 b for the low frequency band areboth close to the arrangement of the pads 212 and are present on theedge portion of one side of the semiconductor chip (the IC chip) 213 andare arranged near the center of the one side (refer to FIG. 3). Thisreason is that in the construction of the semiconductor devices whichare manufactured using the lead frames, as shown in FIG. 3, since thelengths of the leads 200 to 209 become short as the leads are locatedcloser to the center of the edge portion of the semiconductor chip, theshorter input/output leads of the LNA part are used to be intended thereduction of the parasitic inductance.

The offset PLL 309 is provided in the OPLL part; the variable gainamplifier 305 is provided in the PGA part; the divider 307 is providedin the DIV part; the modulator 308 is provided in the QMOD part; thedemodulator 306 is provided in the DEMOD part; the synthesizer 310 isprovided in the Dual Synth part; and the IFVCO 325 is provided in theVCO part.

The IC chip 231 is incorporated in the desired package to become asemiconductor device. A semiconductor device 230 of the firstembodiment, as shown in FIGS. 3 and 4, is of the QFP (Quadrature FlatPackage) structure in which the leads 200 to 209 are projected from theperipheral faces (the sides) of flat quadrangle shaped package 215 madeof insulating resin. The outer end parts of the leads 200 to 209 arebent only one step into the stepped like shape as shown in FIG. 4 tobecome the gull-wiring type which is suitable for the surface mounting.

A quadrangle chip fixing part 214 slightly larger than the IC chip 213and smaller than the package 215 is located in the package 215. Then,the IC.chip 213 is bonded to the main surface of the chip fixing part214 through bonding agent (not shown). In addition, the pads 212 whichprovided on the main surface of the IC chip 213 and the inner end partsof the leads 200 to 209 are connected to one another through conductivewires 211, respectively. Both of the IC chip 213 and the conductivewires 211 are perfectly encapsulated in the package 215.

Suspending leads 216 extends from the corner parts of the chip fixingpart 214 toward the corner parts of the package 215 and also are cut atthe outer peripheral parts of the package 215.

In manufacturing the semiconductor device 230, while not particularlyillustrated, a lead frame is employed. This lead frame is obtained bypatterning a metal plate having a predetermined thickness by theaccurate press or the etching and has the pattern in which the chipfixing part (die pad) 214, the suspending leads 216 for supporting thechip fixing part 214, and the leads 200 to 209 are respectivelyincluded. In addition, the leads 200 to 209 are supported to the frameby fine tie-bars which are provided in an area out of the area in whichthe above-mentioned package 215 is formed. Also, the suspending leads216 are supported to the tie-bars or the frame. Then, after havingformed the package 215 by the resin encapsulation, the unnecessary partsof the lead frame such as the above-mentioned tie-bars are all cut to beremoved therefrom and also the outer end parts of the leads 200 to 209which are projected from the package 215 are formed into the gull-wiringtype, thereby completing the manufacture of a semiconductor device 230.

As shown in FIGS. 3 and 4, the low-noise amplifier (LNA) 210 is providedalong one edge portion of the IC chip 213 at the center of that side anduses, as I/O leads for the LNA, the short leads 201 to 209 having thesmall parasitic inductance.

Next, the layout of the LNA circuit will hereinbelow be described indetail with reference to the schematic view of FIG. 1, and FIGS. 6 and7. In FIG. 1, there are shown: a LNA circuit 147 (i.e., the part whichis surrounded by a dashed line) of the IC chip 213 which is fixed to themain surface of the chip fixing part 214 and is encapsulated with thepackage 215; the leads 201 to 209 and 144 which extend inside andoutside the package 215; wires 211 through which the leads 201 to 209and 144 and the pads 101 to 109 and 128 are connected to one another;matching circuits 134 to 137 connected to the respective leads 201 to207; terminals 138 to 141 connected to the respective matching circuit134 to 137; and a power source line 143 which is arranged outside the ICchip 213 and connected to the lead 209, and a ground line 142 arrangedoutside the IC chip 213.

The LNA circuit 147 has two LNAs, i.e., an LNA 110 for the low frequencyband used in the GSAM system, and an LNA 111 for the high frequency bandused in the DCS 1800 system. Both of the LNAs are constituted by thebipolar transistors. In addition, the electrostatic discharge protectingcircuits 112 to 114 are connected to the electrodes of the LNA 110 forthe low frequency band, respectively, and the electrostatic dischargeprotecting circuits 115 to 117 are connected to the electrodes of theLNA 111 for the high frequency band, so that the electrostatic dischargeof the both of the LNA 110 for the low frequency band and the LNA 111for the high frequency band is prevented.

The pads 101 to 109 of the LNA 110 for the low frequency band and theLNA 111 for the high frequency band are arranged along one edge portionof the IC chip 213, not to place any wirings between the one side andthe pads 101 to 109, and are provided at the center part of an edgeportion 119. This reason is that as described above, the leads 201 to209 and 144, the inner ends of which are made face the center of theedge portion 119 of the IC chip 213 and to the center part of the edgeportion 119 are both short with the distances between the inner ends andthe outer ends, so that it is possible to reduce the parasiticinductance.

In addition, between the respective electrodes for the LNA 110 of thelow frequency band and the LNA 111 of the high frequency band and therespective pads 101 to 109, there are no wirings traversing otherwirings electrically connected between the respective electrodes and thepads 101 to 109, thereby, it is taken into consideration that thewirings through which the electrodes and the pads 101 to 109 areconnected to one another become shorter as much as possible. This reasonis that the parasitic resistance and the parasitic capacity of thewirings are reduced to enhance the gain and the noise characteristics.

The pads 101 to 109 relating to the LNA circuit 147, as shown in FIG. 1,are arranged in a series and in the order from the pads 101 to 109. Thefunction of the pads 101 to 109 is as follows.

The pad 101 is the input pad of the LNA 110 for the low frequency band;the pad 102 is the ground pad of the LNA 110 for the low frequency band;the pad 103 is an input pad of the LNA 110 for the low frequency band;the pad 104 is a first ground pad of the LNA 111 for the high frequencyband; the pad 105 is an input pad of the LNA 111 for the high frequencyband; the pad 106 is a second ground pad of the LNA 111 for the highfrequency band; the pad 107 is an input pad of the LNA 111 for the highfrequency band; the pad 108 is a power source pad of the bias circuit118 and the electrostatic discharge protecting circuits 112 to 117 ofthe LNA 111 for the high frequency band; and the pad 109 is a ground padof the bias circuit 118 and the electrostatic discharge protectingcircuits 112 to 117 of the LNA 111 for the high frequency band.

The leads for the ground pads 102, 104 and 106 of the LNA circuit 147are separated from that of the ground pad 109 for the bias circuit 118for the LNA and the electrostatic discharge protecting circuits 112 to117, so that such structure is prevented from oscillation due to theparasitic inductance generated from the wires and the leads and theparasitic capacitance of the LNA bias circuit 118 and the electrostaticdischarge protecting circuits 112 to 117.

The leads 201 to 209 corresponding to the above-mentioned pads 101 to109, as shown in FIG. 1, are arranged along the edge portion 119 and inthe order from the lead 201 to the lead 209. The function of the leads201 to 209 is as follows.

The lead 201 is an output lead of the LNA 110 for the low frequencyband; the lead 202 is a ground lead of the LNA 110 for the low frequencyband; the lead 203 is an input lead of the LNA 110 for the low frequencyband; the lead 204 is a first ground lead of the LNA 111 for the highfrequency band; the lead 205 is an output lead of the LNA 111 for thehigh frequency band; the lead 206 is a second ground lead for the LNA111 for the high frequency band; the lead 207 is an input lead of theLNA 111 for the high frequency band; the lead 208 is a power source leadof the bias circuit 118 and the electrostatic discharge protectingcircuits 112 to 117 of the LNA 111 for the high frequency band; and thelead 209 is a ground lead of the bias circuit 118 and the electrostaticdischarge protecting circuits 112 to 117 of the LNA 111 for the highfrequency band.

Then, the inner end parts of the leads 201 to 209 and the pads 101 to109 corresponding thereto are electrically connected to one anotherthrough the conductive wires 211, respectively.

As shown in FIG. 1, the receiving circuit 132 and the transmittingcircuit 133 are both arranged in the position which is nearer the centerpart of the IC chip 213 than the LNA circuit 147. In FIG. 1, there areshown pads 126 and 127 in part of the receiving circuit 132 other thanthe LNA circuit 147, and pads 128 in part of the transmitting circuit133. The pads 126 and 127 in part of the receiving circuit 132 arerespectively connected to the electrostatic discharge protectingcircuits 129, 130 in each of which two diodes are connected in parallelwith each other between the ground line 145 of the receiving circuit andthe power source line 146 of the receiving circuit. That is, each of thepads 126 and 127 in part of the receiving circuit system 132 isconnected between the associated two diodes which are connected inseries with each other. Similarly, the pad 128 in part of thetransmitting circuit 133 is connected to the electrostatic dischargeprotecting circuit 131 at a place between the ground line 122 and thepower source line 121, of the transmitting circuit.

In FIG. 1, the ground line 148 of the receiving circuit and the powersource line 146 of the receiving circuit are illustrated with thehatching.

In FIG. 1, a lead 144 is illustrated next to the lead 209 in such a wayas to be arranged in parallel with the lead 209. That lead 144 iselectrically connected to the pad 128 in part of the transmittingcircuit 133 through the wire 211.

The output matching circuit 134 of the LNA 110 for the low frequencyband is connected between the lead 201 and the terminal 138; the inputmatching circuit 135 of the LNA 110 for the low frequency band isconnected between the lead 203 and the terminal 139; the output matchingcircuit 136 of the LNA 111 for the high frequency band is connectedbetween the lead 205 and the terminal 140; and the input matchingcircuit 137 of the LNA 111 for the high frequency band is connectedbetween the lead 207 and the terminal 141.

The output matching circuit 134 of the LNA 110 for the low frequencyband outputs the high frequency signal through the terminal 138 and alsosupplies the power source voltage from the power source line 143 to thecollector 12C of the LNA 110 for the low frequency band. The inputmatching circuit 135 of the LNA 110 for the low frequency band inputsthe high frequency signal to the base 13C of the LNA 110 for the lowfrequency band.

The output matching circuit 136 of the LNA 111 for the high frequencyband outputs the high frequency signal through the terminal 140 and alsosupplies the power source voltage from the power source line 143 to thecollector 12C of the LNA 111 for the high frequency band. The inputmatching circuit 137 of the LNA 111 for the high frequency band inputsthe high frequency signal to the base 13C of the LNA 111 for the highfrequency band.

The leads 202, 204 and 206 are electrically connected to the emitters14C of the LNA 110 for the low frequency band and the LNA 111 for thehigh frequency band and also are electrically connected to the ground inthe outside of the IC chip.

The LNA 110 for the low frequency band (the transistor part) is arrangedadjacent to the pads 101 to 103 in such a way as to be made the shortestthe high frequency wirings 120 a arranged between the base 13C of theLNA 110 for the low frequency band and the pad 103, and the highfrequency wiring 120 b arranged between the emitter 14C of the LNA 110for the low frequency band and the pad 102. In also the case of the LNA111 for the high frequency band, similarly, the LNA 111 for the highfrequency band is arranged adjacent to the pads 106 and 107.

The electrostatic discharge protecting circuits 112 to 114 forprotecting the LNA 110 for the low frequency band from the electrostaticdischarge are respectively arranged in the vicinity of the LNA 110 forthe low frequency band and also are respectively connected to thecollector 12C, the base 13C and the emitter 14C. Likewise, theelectrostatic discharge protecting circuits 115 to 117 for protectingthe LNA 111 for the high frequency band from the electrostatic dischargeare arranged in the vicinity of the LNA 111 for the high frequency band.

Also, the bias circuit 118 is arranged in the vicinity of the LNA 110for the low frequency band and the LNA 111 for the high frequency band,and is respectively connected to the LNA 110 for the low frequency bandand the LNA 111 for the high frequency band through signal lines 123 aand 123 b which are respectively illustrated by broken lines.

A bias resistor 124 of the LNA 110 for the low frequency band convertsthe bias current from the bias circuit 118 into a bias voltage to supplythe bias voltage thus obtained to the LNA 110 for the low frequencyband. A bias resistor 125 of the LNA 111 for the high frequency bandconverts the bias current from the bias circuit 118 into a bias voltageto apply the bias voltage thus obtained to the LNA 111 for the highfrequency band.

The electrostatic discharge protecting circuits 112 to 117 and the biascircuit 118 are supplied with the electric power through the powersource line 121 and the ground line 122 of the transmitting circuit. Inthe TDMA (Time Division Multiple Access), since the transmitting circuit133 is not operated when the LNA 147 and receiving circuit 132 is beingoperated, any of the noises from the power source system are notcontained therein. This electric power is supplied thereto from theoutside of the IC chip 213 throuah the power source line in which thelead 208, the wire 211 and the power source pad 108 are electricallylinked with one another, and the power source line in which the lead209, the wire 211 and the ground pad 109 are electrically linked witheach other. These power source lines are also connected to thetransmitting circuit system 133.

FIG. 6 is a schematic plan view showing the wiring pattern of thebipolar transistor constituting the LNA 110 for the low frequency band,and FIG. 7 is a schematic cross sectional view showing the wiring of thebipolar transistor.

As shown in FIG. 7, the bipolar transistor is constituted by thecollector region 12, the base region 13 and the emitter region 14 whichare formed in this order in a semiconductor layer 11 of a P-type orN-type, and the collector electrode 12 c (the first electrode), the baseelectrode 13 c (the control electrode) and the emitter electrode 14 c(the second electrode) which are respectively connected to the collectorregion 12, the base region 13 and the emitter region 14 (refer to FIG.6) FIG. 6 shows high frequency wirings 120 a and 120 b through which theelectrodes and the pads are connected to one another.

In addition, FIG. 7 shows the wiring structure of the high frequencywiring 120 b through which the emitter electrode 14 c and the ground pad102 of the LNA 110 for the low frequency band are connected to eachother. A multilayer insulating film 15 is formed on the surface of thesemiconductor layer 11. Then, conductive layers 16 a, 16 b and 16 c ofthree layers, and contact plugs 17 a and 17 b each made of a conductor,through which the conductive layers are connected to one another areformed in and over the insulating film 15, and the emitter electrode 14c, the high frequency wiring 120 b and the pad 102 are formed on thebasis of those constituent elements.

The conductive layer 16 a is the lowest layer and also a part thereofcontacts the emitter region 14 to constitute the emitter electrode 14 c.The conductive layer 16 b is the intermediate layer, and is connected tothe conductive layer 16 a through the contact plug 17 a as well as isconnected to the conductive layer 16 c as the most upper layer throughthe contact plug 17 b. The conductive layer 16 c is the most upperconductive layer which is formed on the surface of an insulating film 15and an outer end part thereof is wide and forms the pad 112. Each of theabove-mentioned conductive layers 16 a, 16 b and 16 c, for example, ismade of aluminum.

As shown in FIG. 6, the wiring arranged between the base electrode 13 cand the pad 103, and the wiring arranged between the emitter electrode14 c and the pad 102 become short to form the high frequency wirings 120a and 120 b, respectively.

In addition, the above-mentioned semiconductor layer 11 is constitutedby a part or the like, which is electrically isolated, of an epitaxiallayer which is formed on the main surface of the semiconductor substratemade of silicon constituting the IC chip 213.

In this connection, while not particularly illustrated, the wiringpattern of the LNA 111 for the high frequency band also becomes thepattern which approximates to that of the LNA 110 for the low frequencyband, and thus the wiring pattern which becomes the shortest in terms oflayout is adopted. In the case of the LNA 111 for the high frequencyband, in order to reduce the parasitic inductance of the wire 211 andthe leads 204, 206 to realize the high gain, the emitter is connected tothe pads 212, 104 and 106, respectively.

Next, referring back to FIG. 1, the layout of the transmitting andreceiving circuit which is arranged in the periphery of the LNA circuit147 will hereinbelow be described simply. The power source line 146 ofthe receiving circuit 132 and the ground line 145 of the receivingcircuit 132 are both connected to the outside of the IC chip 213 througha power source lead and a ground lead (both not shown) to supply thepower source voltage to the receiving circuit 132. The pads 126 and 127in part of the receiving circuit are connected to leads (not shown)through the wires, respectively, to carry out the input and output ofthe signals to and from the outside of the IC chip 213. The pad 128 inpart of the transmitting circuit 133 is connected to the lead 144through the wire 211 to carry out the input and output of the signals toand from the outside of the IC chip 213. Other circuits other than theLNA circuit are arranged in the order of the ground lines 122, 145, theelectrostatic discharge protecting circuits 129 to 131, the power sourcelines 121, 146, the pads 126 to 128, the transmitting circuit 133, thereceiving circuit 132 such as a synthesizer 310, IFVCO325 and devider307 from the edge portion 119 of the IC chip 213 towards the center ofthe IC chip 213.

The receiving circuit 132 shown in FIG. 1 corresponds to the highfrequency band receiving mixer 303 a, the low frequency band receivingmixer 303 b, the mixer 304 in the next stage, the variable gainamplifier 305 and the demodulator 306 which are all shown in FIG. 2, andalso the transmitting circuit 133 shown in FIG. 1 corresponds to themodulator 308 and the offset PLL 309 shown in FIG. 2.

According to the first embodiment of the present invention, there areoffered the following effects.

-   (1) Since any of wirings other than the wirings for the low-noise    amplifier(s) are not arranged between the pads 101 to 109, and the    collector electrode 12 c, the base electrode 13 c and the emitter    electrode 14 c of the transistor, the distances between the    collector electrode 12 c, the base electrode 13 c and the emitter    electrode 14 c, and the pads 101 to 109 become short. As a result,    the wiring capacitance is reduced, the gain is increased and the    noise characteristic become excellent due to the reduction of the    wiring resistance.-   (2) Since no wiring is arranged between the edge portion 119 of the    IC chip 213 and the pads 101 to 109 at all, the lengths of the wires    through which the pads 101 to 109 and the inner ends of the leads    201 to 209 and 144 become short. As a result, the noise    characteristic and gain become excellent due to the reduction of the    parasitic inductance of the wires.-   (3) The LNA 210 (designated with reference numerals 110 or 111 in    FIG. 1), as shown in FIG. 3, is present on the side of the edge    portion 119 of the semiconductor chip 213 and also is arranged near    the center of that edge portion 119. In the package structure    employing the leads 200 to 209, the lengths of the leads 200 to 209    which are arranged near the center of the above-mentioned edge    portion 119 are all short. As a result, the distances from the pads    101 to 109 to the outer ends of the leads 200 to 209 which are    projected to the outside of the package become short, and hence it    is possible to increase the gain and to improve the noise    characteristic.-   (4) Since there is adopted the wiring structure in which the wirings    extended from the pads 101 to 109, respectively, are coupled to the    base electrode of the transistor, and one electrodes of the    protection diodes 112 to 117 which are provided for the    above-mentioned transistor, the layout design of the parts of the    circuits becomes easy to be carried out.-   (5) In the wireless communication system, since the low-noise    amplifiers 110, 111 amplify the received signal having a very small    magnitude by the circuit in the first stage of the receiving circuit    to send the amplified signal to either the mixer 303 a or 303 b in    the next stage, the low-noise amplifiers 110, 111 control greatly    the characteristics of the whole receiving circuit. Therefore,    according to the first embodiment, since the high gain and the low    noise are obtained in the low-noise amplifier 147, it is possible to    enhance the characteristics of the whole receiving circuit of the    wireless communication system.-   (6) From the item (5), since the gain and the noise characteristic    of the low-noise amplifiers 110, 111 are excellent, the    specification of the circuits after the mixer 303 a or 393 b in the    next stage can be less severe and hence the circuit design becomes    easy to be carried out.

Second Embodiment

FIG. 8 is a schematic block diagram, partly in circuit diagram, showinga configuration in part of a semiconductor integrated circuit device, inwhich the low-noise amplifiers 110 and 111 are both incorporated in adual band wireless communication system according to a second embodimentof the present invention, and FIG. 9 is a schematic plan view showingthe wiring pattern of a bipolar transistor constituting the low-noiseamplifier 110 in the IC chip 213 which is incorporated in the wirelesscommunication system of the second embodiment.

While in the first embodiment shown in FIG. 1, the part in which thebias circuit 118 is provided between the LNA 110 for the low frequencyband and the LNA 111 for the high frequency band has the layout in whichthe peripheral part of the LNA circuit 147 becomes hollow inwardly withrespect to the flat surface, the area which becomes hollow inwardly withrespect to the flat surface may not be effectively utilized in thelayout design of the receiving circuit 132 and the transmitting circuit133 in some cases. In other words, this hollow area becomes theunnecessary area.

Then, the second embodiment provides the arrangement of the LNA circuit147 which makes easy the layout design utilizing effectively the area.That is, the LNA 110 for the low frequency band, the LNA 111 for thehigh frequency band and the electrostatic discharge protecting circuits112 to 117 for these amplifiers 110 and 111 are arranged in one areahaving a contour which is surrounded with an edge portion 119 of theabove-mentioned semiconductor chip (the IC chip) 213, an opposite side20 which is opposite to that edge portion 119 and mutually-oppositesides 21 which link the edge portion 119 and the side 20 oppositethereto with each other. Then, the opposite side 20, in order to belinked with the mutually-opposite sides 21, has the contour in which thepower source line 121 and the ground line 122 are changed step by step.Such a contour is provided, whereby the area of the layout can beeffectively utilized.

In other words, the amplifiers 110 and 111 for the signal processingsystems, and the electrostatic discharge protecting circuits 112 to 117which are connected to these amplifiers, respectively, are provided inone area which is in turn formed between the edge portion 119 of thesemiconductor chip, and the opposite side which is opposite to the edgeportion 119. Thus, the side 20 of the area near the above-mentionedopposite side is formed in the form of the contour in which the side 20is changed step by step through the power source line 121 and the groundline 122.

While if this layout is adopted, as shown in FIG. 9, the patterns of thepower source line 121 and the ground line 122 of the transmittingcircuit become complicated as compared with the patterns of these linesshown in FIG. 6, since each of the bent patterns of the power sourceline and the ground line on the side 20 of the LNA circuit 110 is notcomplicated as compared with FIG. 6, the layout of another circuit whichis adjacent to the LNA 110 becomes easy to be made.

In this connection, in the case where the power source line 121 and theground line 122 on the side of the opposite side 20 are changed step bystep, the wiring patterns of the LNA 111 for the high frequency band andthe LNA 110 for the low frequency band are forced to be changed, so thatthe wiring lengths of these patterns of these amplifiers 110 and 111 areboth increased. In this case, it is desirable in terms of therealization of the high performance of the communication system that theincrease in the wiring length for the LNA 111 for the high frequencyband is made smaller than that for the LNA 110 for the low frequencyband, and the burden of the increase in the wiring length is imposed onthe LNA 110 for the low frequency band as much as possible.

Third Embodiment

FIGS. 10 and 11 show a third embodiment of the present invention. FIG.10 is a schematic cross sectional view showing the construction of a CSP(Chip Size Package) containing a semiconductor integrated circuitdevice, which is incorporated in the wireless communication system, andFIG. 11 is a block diagram, partly in circuit diagram, showing thelayout of a multilayer ceramic substrate and the like in which the CSPcontaining the semiconductor integrated circuit device is incorporated.

The CSP has the construction in which solder bumps 601 are respectivelyprovided on the pads (not shown) of the IC chip 213; these solder bumps601 are respectively bonded to the pads (not shown) on the surface of amultilayer ceramic substrate 603 to be attached thereto; and a filler602 is led into the space defined between the IC chip 213 and themultilayer ceramic substrate 603 to fix the IC chip 213 to themultilayer ceramic substrate 603. In addition, the rear face (the lowerface in FIG. 10) of the multilayer ceramic substrate 603 is providedwith the land planes 605. Then, the pads of the IC chip 213 and the landplanes 605 of the rear face of the multilayer ceramic substrate 603 areconnected to one another through via holes which are bored through themultilayer ceramic substrate 603 and the wirings 604 which are formed byleading a conductive material into these via holes.

The input and output of the signals and the supply of the electric powerfrom the power source are carried out through these land planes 605. Asapparent from the figure, since the CSP has no wire and lead as in theQFP and also the signals can be inputted and outputted roughly rightunder the pads, the parasitic inductance can be reduced, and hence thegain and the noise characteristics can be improved.

FIG. 11 shows an example of the layout of the LNAs 110 and 111 eachemploying the CSP. Since the package structure as shown in FIG. 10 isadopted, the lengths of the leads are not taken into consideration atall, and also in addition to the central part of the side of the IC chip213, the LNA 110 for the low frequency band and the LNA 111 for the highfrequency band may also be arranged in the corner of the IC chip 213. Byarranging the LNAs 110 and 111 in the corner of the IC chip 213, thesignal can be inputted and outputted to and from the LNA 110 for the lowfrequency band on the side of edge portion and also the signal can beinputted/outputted to and from the LNA 111 for the high frequency bandon the side of other side intersecting perpendicularly that side.

FIG. 11 is a block diagram, partly in circuit diagram, showing theconnection among the LNA 110 for the low frequency band and the LNA 111for the high frequency band, the electrostatic discharge protectingcircuits 112 to 114, and the electrostatic discharge protecting circuits115 to 117 for the LNA 111 for the high frequency band all of which areshown in the form of the LNA circuit 147 of FIG. 1, and the CSP discretecomponents which are intended to be mounted from the outside. In thisconnection, the land planes are arranged right under the pads 101 to109. Then, broken lines extending from the pads 101 to 109 exhibit thewirings which are distributed from the land planes to the positionsunder the CSP.

In this connection, the CSP may be applied to each of the IC chips 213at all shown in FIGS. 1 and 8. In this case, since the wire 211 and theleads 200 to 209 become unnecessary, the parasitic inductance can bereduced.

Above, while the present invention made by the present inventors hasbeen concretely described on the basis of the preferred embodiments, itis to be understood that the present invention is not intended to belimited to the above-mentioned preferred embodiments and hence thevarious changes and modifications will occur to those skilled in the artwithout departing from the subject matter of the invention. That is,while in the preferred embodiments, the bipolar transistors are employedas the transistors, other transistors, e.g., MOS FETs (Metal OxideSemiconductor Field Effect Transistor) or HBTs (Hetero Junction BipolarTransistor) may also be employed. In such a case, there are offered thesame effects as those of the above-mentioned embodiments.

In addition, the present invention may be applied to the communicationsystem of triple bands or the like, as well as a plurality of bands.

While in the above description, the case where the invention made by thepresent inventors is applied to the GSM/DCS 1800 oriented wirelesscommunication system as the utilization field becoming the background ofthe invention, the present invention is not intended to be limitedthereto. For example, the present invention can be similarly applied tothe wireless communication systems each having an LNA of several GHzband such as WCDMA (Wideband Code Division Multiple Access) or cdmaOne.Since in these wireless communication systems, the wiring capacity, thewiring resistance and the parasitic inductance degrade the highfrequency characteristics, the present invention is applied thereto,whereby the wiring capacity, the wiring resistance and the parasiticinductance can be reduced, and also the high frequency characteristicscan be enhanced. In this connection, since in the CDMA, the transmittingand receiving operations are simultaneously carried out, it is requiredthat the power source system for the LNA bias circuit and theelectrostatic discharge protecting circuits needs to be speciallyprovided.

1. A semiconductor device for use in a radio communication device,comprising: a semiconductor chip including a modulator, a demodulatorand a differential low noise amplifier having a pair of radio signalinputs; a first electrode and a second electrode for the pair of radiosignal inputs disposed on a main surface of the semiconductor chip; achip mounting portion over which the semiconductor chip is mounted; aplurality of leads disposed around the chip mounting portion; a firstconductive wire electrically connecting the first electrode and a firstlead of the plurality of leads; a second conductive wire electricallyconnecting the second electrode and a second lead of the plurality ofleads; and a resin sealing body covering the semiconductor chip, partsof the leads and part of the chip mounting portion, wherein each of thefirst and second leads has a first portion and a second portion; thesecond portion extends inwardly from the first portion toward the chipmounting portion; the second portion extends obliquely from the firstportion in a plan view; and the first and second conductive wires arebonded to the second portions of the first and second leads,respectively.
 2. The semiconductor device according to claim 1, whereinthe first and second conductive wires are of substantially same length.3. The semiconductor device according to claim 1, wherein thedifferential low noise amplifier processes a radio signal received by anantenna.
 4. The semiconductor device according to claim 1, wherein thesemiconductor device is electrically coupled with a base band circuit;an output signal from the demodulator is inputted into the base bandcircuit; and an output signal from the base band circuit is inputtedinto the modulator.